Bumping this because i also want to know more about Nightsky "hd". I know there's alternate .exe that make the game run in fullscreen but it's aliased. Desperately searching for a proper hd/fullscreen version of the game..

With NightSky HD, the game automatically launches in fullscreen with your native resolution. And it's optimized for that. If you already owned the game before, it's supposed to be already updated with the HD version. So basically, both of the games are even; the old version was just replaced with the new one.

I remember getting NightSky HD from one of the previous Humble Bundles, and back then Steam had only the original, low-res version, with Night Sky HD being available for download as a DRM-free package. So is it actually HD on Steam now? That would be way more obvious if the game description or title were updated. Also, one more reason to play the game all over again. Love it.